The Moorlands of North Eastern Yorkshire Their Natural History And Origin
The Moorlands of North Eastern Yorkshire Their Natural History And Origin
Frank Elgee
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But besides these special adaptations to facilitate dispersal, there is a universal one for plants, viz. : seeds fall from the parent plant to the ground, and there germinate if there is space or the conditions favour. The young plants in their turn bear seeds which spring up in the same way ; and so in this manner they extend their range inch by inch, and slowly march over the land. Doubtless this has to some extent been the case with the moorland species, but their 156 « a W O o H n 5 H n W X... H O o s (/) O 157 Moorlands of North-Eastern Yorkshire special modes of dispersal have no doubt chiefly assisted in their distribution. We can imagine our moorland species radiating from their original homes to the remotest bounds of their range. Necessarily, a long time will be required for this dispersal, and roughly speaking, the wider the range the older the species ; for only after the lapse of long periods could widely-ranging forms spread over extensive areas, and pass from one continent to another, in many cases by land connections which have long been submerged.
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